Add django-todo to README

README.md

@@ -1307,6 +1307,7 @@ See https://staticsitegenerators.net and https://www.staticgen.com
 - [Coordino](http://coordino.com/) - Open Source question and answer system on top of CakePHP. ([Source Code](https://github.com/Datawalke/Coordino)) `MIT` `PHP`
 - [Deskulu](https://github.com/Taskulu/deskulu) - Opensource helpdesk and ticketing system based on Drupal 7. ([Demo](https://help.taskulu.com)) `GPL-2.0` `PHP`
 - [DiamanteDesk](http://diamantedesk.com/) - DiamanteDesk is FREE Open Source easy-to-use help-desk solution. ([Demo](http://diamantedesk.com/demo/), [Source Code](https://github.com/eltrino/diamantedesk-application)) `OSL-3.0` `PHP`
+- [django-todo](http://django-todo.org/) - django-todo is a pluggable, multi-user, multi-group, multi-list todo and ticketing system - a reusable app designed to be dropped into any existing Django project. ([Demo](http://django-todo.org/), [Source Code](https://github.com/shacker/django-todo)) `BSD-3-Clause` `Python/Django`
 - [Flyspray](http://www.flyspray.org/) - Uncomplicated, web-based bug tracking system. ([Source Code](https://github.com/Flyspray/flyspray)) `GPL-2.0` `PHP`
 - [FreeScout](https://github.com/freescout-helpdesk/freescout) - Open source clone of Help Scout: email-based customer support application, help desk and shared mailbox. `AGPL-3.0` `PHP`
 - [Helpy](https://helpy.io) - Helpy is a modern, open source helpdesk customer support application. Features include knowledgebase, community discussions and support tickets integrated with email. ([Demo](https://demo.helpy.io), [Source Code](https://github.com/helpyio/helpy)) `MIT` `Ruby`